/Engine/Source/Editor/UnrealEd/Public/FileHelpers.h
Saves the specified level. SaveAs is performed as necessary.
true if the level was saved.
static bool SaveLevel ( [ULevel](API\Runtime\Engine\Engine\ULevel) * Level, const [FString](API\Runtime\Core\Containers\FString) & DefaultFilename, [FString](API\Runtime\Core\Containers\FString) * OutSavedFilename )